Nice snags! :approve:

You've probably got the Sonnet PDS mounted CrescendoNuBus & the matching passthru cable for either the standard PDS Video Card or the HPV Card with a full load of VRAM on whichever you've got.

If there are S-Video ports (same connector as ADB) above & below the DB-15 Mac Video Port, you've got the HPV VidCap Card, otherwise it's a nice Video Card.